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Simplifying 7a + -21 = 56 Reorder the terms: -21 + 7a = 56 Solving -21 + 7a = 56 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 7a = 56 + 21 Combine like terms: -21 + 21 = 0 0 + 7a = 56 + 21 7a = 56 + 21 Combine like terms: 56 + 21 = 77 7a = 77 Divide each side by '7'. a = 11 Simplifying a = 11
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